The above video (almost 20 minute long) provides a simple tutorial explaining how to calculate Spearman’s Rank coefficient of correlation. Part of the video explains how to assign ranks to the values of a given variable and the remaining part explains the calculations involved in finding the correlation coefficient. You can skip the first part and jump to time 8.52 if you already know how to assign ranks.

I teach in an undergraduate college and this video may be useful to students pursuing B.Com, BMS, BFM under Mumbai University.

The explanation is quite basic keeping in mind that many students may not have opted for Math in the 11th and 12th grade.